Fixes tags need work in the drm tree

[Mark Brown]

In commit

  3b1f4d5e47b36 ("drm/amd/display: Fix dangling pointer in connector reset 
function")

Fixes tag

  Fixes: e7b07ceef2a6 ("drm/amd/display: Merge amdgpu_dm_crtc and 
dm_crtc_state")

has these problem(s):

  - Subject does not match target commit subject
    Just use
        git log -1 --format='Fixes: %h ("%s")'

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